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Jun 29, 2018
06/18

by
Blanchard Etienne

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We construct in this note a unital properly infinite C*-algebra which is not K$_1$-injective.

Topics: Operator Algebras, Mathematics

Source: http://arxiv.org/abs/1606.04773

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Jun 29, 2018
06/18

by
Etienne Ferrier

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Sub-surface scattering is key to our perception of translucent materials. Models based on diffusion theory are used to render such materials in a realistic manner by evaluating an approximation of the material BSSRDF at any two points of the surface. Under the assumption of perpendicular incidence, this BSSRDF approximation can be tabulated over 2 dimensions to provide fast evaluation and importance sampling. However, accounting for non-perpendicular incidence with the same approach would...

Topics: Graphics, Computing Research Repository

Source: http://arxiv.org/abs/1609.02072

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Jun 29, 2018
06/18

by
Etienne Adam

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We classify the possible behaviors of a class of one-dimensional stochastic recurrent growth models. In our main result, we obtain nearly optimal bounds for the tail of hitting times of some compact sets. If the process is an aperiodic irreducible Markov chain, we determine whether it is null recurrent or positive recurrent and in the latter case, we obtain a subgeometric convergence of its transition kernel to its invariant measure. We apply our results in particular to state-dependent...

Topics: Probability, Mathematics

Source: http://arxiv.org/abs/1603.09702

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Oct 19, 2016
10/16

by
Étienne Blondeau

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Soirée de l'indépendance de OUI Québec Quel a été l'outil de l'indépendance des États-Unis, de la montée en force de la Corée du Sud et des autres « dragons asiatiques » ? Quel outil a fait de la Chine une superpuissance mondiale ? Une monnaie nationale, au service du public et de l'investissement. Créer la monnaie pour les besoins de la population, voilà la vraie souveraineté, celle qui évite les dettes dans une monnaie étrangère. Cette conférence explique la...

Topics: korrigane, monnaie, souveraineté, OUIQuébec

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Jun 29, 2018
06/18

by
Etienne Couturier

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Thin vegetal shells have recently been a significant source of inspiration for the de\text{sign} of smart materials and soft actuators. Herein is presented a novel analytical family of isometric deformations with folds, inspired by a banana-shaped seedpod, which converts a vertical closing into either an horizontal closing or an opening depending on the location of the fold. Similarly to the seedpod, optimum shapes for opening ease are the most elongated ones.

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.05467

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1.0

Jun 29, 2018
06/18

by
Artur Aleksanyan; Etienne Brasselet

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We report on a soft route towards optical vortex coronagraphy based on self-engineered electrically tunable vortex masks based on liquid crystal topological defects. These results suggest that a nature-assisted technological approach to the fabrication of complex phase masks could be useful in optical imaging whenever optical phase singularities are at play.

Topics: Optics, Physics

Source: http://arxiv.org/abs/1609.05789

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Jun 29, 2018
06/18

by
Etienne Couturier; Nicolas Jacquet

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A universal ordinary differential equation $C^{\infty}$ of order 3 is constructed here. The equation is universal in the sense that any continuous function on a real segment can be approximated by a solution of this equation with an arbitrary accuracy in uniform norm.

Topics: Classical Analysis and ODEs, Mathematics

Source: http://arxiv.org/abs/1610.09148

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Jun 29, 2018
06/18

by
Peter Kratz; Etienne Pardoux

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We establish large deviation estimates for Poisson driven models of infectious disease, and apply those estimates to the time of exit from the basin of attraction of an endemic equilibrium. We apply our results to the classical SIRS model.

Topics: Probability, Mathematics

Source: http://arxiv.org/abs/1602.02803

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Jun 29, 2018
06/18

by
Victor Reutenauer; Etienne Tanré

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In this paper, we present extensions of the exact simulation algorithm introduced by Beskos et al. (2006). First, a modification in the order in which the simulation is done accelerates the algorithm. In addition, we propose a truncated version of the modified algorithm. We obtain a control of the bias of this last version, exponentially small in function of the truncation parameter. Then, we extend it to more general drift functions. Our main result is an unbiased algorithm to approximate the...

Topics: Probability, Mathematics

Source: http://arxiv.org/abs/1609.07431

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0.0

Jun 29, 2018
06/18

by
Yanan Li; Etienne Burdet

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When carrying out tasks in contact with the environment, humans are found to concurrently adapt force, impedance and trajectory. Here we develop a robotic model of this mechanism in humans and analyse the underlying dynamics. We derive a general adaptive controller for the interaction of a robot with an environment solely characterised by its stiffness and damping, using Lyapunov theory.

Topics: Computing Research Repository, Robotics

Source: http://arxiv.org/abs/1605.07834

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0.0

Jun 29, 2018
06/18

by
Etienne Mann; Thomas Reichelt

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We discuss the behavior of Landau-Ginzburg models for toric orbifolds near the large volume limit. This enables us to express mirror symmetry as an isomorphism of Frobenius manifolds which aquire logarithmic poles along a boundary divisor. If the toric orbifold admits a crepant resolution we construct a global moduli space on the B-side and show that the associated tt^*-geometry exists globally.

Topics: Algebraic Geometry, Mathematics

Source: http://arxiv.org/abs/1605.08937

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Jun 29, 2018
06/18

by
Mushegh Rafayelyan; Etienne Brasselet

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We report on the experimental realization of flat mirrors enabling the broadband generation of optical vortices upon reflection. The effect is based on the geometric Berry phase associated with the circular Bragg reflection phenomenon from chiral uniaxial media. We show the reflective optical vortex generation from both diffractive and nondiffractive paraxial light beams using spatially patterned chiral liquid crystal films. The intrinsic spectrally broadband character of spin-orbit generation...

Topics: Optics, Physics

Source: http://arxiv.org/abs/1606.02762

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Jun 29, 2018
06/18

by
Etienne Bernard; Pierre Gabriel

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We are interested in the large time behavior of the solutions to the growth-fragmentation equation. We work in the space of integrable functions weighted with the principal dual eigenfunction of the growth-fragmentation operator. This space is the largest one in which we can expect convergence to the steady size distribution. Although this convergence is known to occur under fairly general conditions on the coefficients of the equation, we prove that it does not happen uniformly with respect to...

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1605.03030

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Jun 29, 2018
06/18

by
Marc Durand; Etienne Guesnet

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The Cellular Potts Model (CPM) is a lattice based modeling technique which is widely used for simulating cellular patterns such as foams or biological tissues. Despite its realism and generality, the standard Monte Carlo algorithm used in the scientific literature to evolve this model preserves connectivity of cells on a limited range of simulation temperature only. We present a new algorithm in which cell fragmentation is forbidden for all simulation temperatures. This allows to significantly...

Topics: Quantitative Biology, Soft Condensed Matter, Condensed Matter, Cell Behavior

Source: http://arxiv.org/abs/1609.03832

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Jun 29, 2018
06/18

by
Etienne Sandier; Itai Shafrir

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We prove that a local minimizer of the Ginzburg-Landau energy in ${\mathbb R}^3$ satisfying the condition $\liminf_{R\to\infty}E(u;B_R)/RlnR < 2\pi$ must be constant. The main tool is a new sharp eta-ellipticity result for minimizers in dimension three that might be of independent interest.

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1612.00821

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0.0

Jun 29, 2018
06/18

by
Etienne Pardoux; Aurel Rascanu

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It is well-known since the work of Pardoux and Peng [12] that Backward Stochastic Differential Equations provide probabilistic formulae for the solution of (systems of) second order elliptic and parabolic equations, thus providing an extension of the Feynman-Kac formula to semilinear PDEs, see also Pardoux and Rascanu [14]. This method was applied to the class of PDEs with a nonlinear Neumann boundary condition first by Pardoux and Zhang [15]. However, the proof of continuity of the extended...

Topics: Probability, Mathematics

Source: http://arxiv.org/abs/1602.01309

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0.0

Jun 29, 2018
06/18

by
Etienne Pardoux; Brice Samegni-Kepgnou

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We consider a general class of epidemic models obtained by applying a random time change to a collection of Poisson processes and we show the large deviation principle for such models. We generalize to a more general situation the approach followed by Dolgoaschinnykh [3] in the case of the SIR epidemic model. Thanks to an assumption which is satisfied in many examples, we simplify the recent work by P. Kratz and E. Pardoux [8].

Topics: Probability, Mathematics

Source: http://arxiv.org/abs/1606.01619

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0.0

Jun 29, 2018
06/18

by
Etienne Callies; Tomás Yany-Anich

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Massive networks have shown that the determination of dense subgraphs, where vertices interact a lot, is necessary in order to visualize groups of common interest, and therefore be able to decompose a big graph into smaller structures. Many decompositions have been built over the years as part of research in the graph mining field, and the topic is becoming a trend in the last decade because of the increasing size of social networks and databases. Here, we analyse some of the decompositions...

Topics: Discrete Mathematics, Data Structures and Algorithms, Computing Research Repository, Social and...

Source: http://arxiv.org/abs/1604.08507

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Jun 29, 2018
06/18

by
Pierre-Étienne Meunier; Damien Regnault

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We prove a result which strongly hints at the computational weakness of a model of tile assembly that has so far resisted many attempts of formal analysis or positive constructions. Specifically, we prove that, in Winfree's abstract Tile Assembly Model, when restricted to use only noncooperative bindings, any long enough path starting from the seed that can grow in all terminal assemblies is pumpable, meaning that this path can be extended into an infinite, ultimately periodic path. This result...

Topics: Formal Languages and Automata Theory, Computational Complexity, Computing Research Repository

Source: http://arxiv.org/abs/1610.07908

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Jun 29, 2018
06/18

by
Charles Bouveyron; Etienne Côme; Julien Jacques

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Bike sharing systems (BSSs) have become a means of sustainable intermodal transport and are now proposed in many cities worldwide. Most BSSs also provide open access to their data, particularly to real-time status reports on their bike stations. The analysis of the mass of data generated by such systems is of particular interest to BSS providers to update system structures and policies. This work was motivated by interest in analyzing and comparing several European BSSs to identify common...

Topics: Applications, Statistics

Source: http://arxiv.org/abs/1601.07999

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0.0

Jun 29, 2018
06/18

by
Youssef Mroueh; Etienne Marcheret; Vaibhava Goel

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We introduce co-occurring directions sketching, a deterministic algorithm for approximate matrix product (AMM), in the streaming model. We show that co-occuring directions achieves a better error bound for AMM than other randomized and deterministic approaches for AMM. Co-occurring directions gives a $1 + \epsilon$ -approximation of the optimal low rank approximation of a matrix product. Empirically our algorithm outperforms competing methods for AMM, for a small sketch size. We validate...

Topics: Computing Research Repository, Learning

Source: http://arxiv.org/abs/1610.07686

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Jun 29, 2018
06/18

by
Etienne Bernard; Marie Doumic; Pierre Gabriel

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We study the asymptotic behaviour of the following linear growth-fragmentation equation $$\frac{\partial}{\partial t} u(t,x) + \dfrac{\partial}{\partial x} \big(x u(t,x)\big) + B(x) u(t,x) =4 B(2x)u(t,2x),$$ and prove that under fairly general assumptions on the division rate $B(x),$ its solution converges towards an oscillatory function, explicitly given by the projection of the initial state on the space generated by the countable set of the dominant eigenvectors of the operator. Despite the...

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1609.03846

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0.0

Jun 29, 2018
06/18

by
Fred Mesnard; Etienne Payet; German Vidal

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Concolic testing is a popular dynamic validation technique that can be used for both model checking and automatic test case generation. We have recently introduced concolic testing in the context of logic programming. In contrast to previous approaches, the key ingredient in this setting is a technique to generate appropriate run-time goals by considering all possible ways an atom can unify with the heads of some program clauses. This is called "selective" unification. In this paper,...

Topics: Logic in Computer Science, Computing Research Repository

Source: http://arxiv.org/abs/1608.03054

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Jun 29, 2018
06/18

by
Etienne Birmelé; Fabien De Montgolfier; Léo Planche

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The Minimum Eccentricity Shortest Path (MESP) Problem consists in determining a shortest path (a path whose length is the distance between its extremities) of minimum eccentricity in a graph. It was introduced by Dragan and Leitert [9] who described a linear-time algorithm which is an 8-approximation of the problem. In this paper, we study deeper the double-BFS procedure used in that algorithm and extend it to obtain a linear-time 3-approximation algorithm. We moreover study the link between...

Topics: Discrete Mathematics, Computational Complexity, Computing Research Repository

Source: http://arxiv.org/abs/1609.04593

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0.0

Jun 29, 2018
06/18

by
Mika Hirvensalo; Etienne Moutot; Abuzer Yakaryılmaz

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We investigate the computational power of affine automata (AfAs) introduced in [4]. In particular, we present a simpler proof for how to change the cutpoint for any affine language and a method how to reduce error in bounded error case. Moreover, we address to the question of [4] by showing that any affine language can be recognized by an AfA with certain limitation on the entries of affine states and transition matrices. Lastly, we present the first languages shown to be not recognized by AfAs...

Topics: Formal Languages and Automata Theory, Computing Research Repository

Source: http://arxiv.org/abs/1612.01870

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0.0

Jun 29, 2018
06/18

by
Ruben Y. Cohen; Etienne Brion; Frédéric Grosshans

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We question the microcanonical hypothesis, often made to account for the thermalization of complex closed quantum systems, on the specific example of a chain of two-level atoms optically driven by a resonant laser beam and strongly interacting via Rydberg-Rydberg dipole-dipole interactions. Along its (necessarily unitary) evolution, this system is indeed expected to thermalize, i.e. observables, such as the number of excitations, stop oscillating and reach equilibrium-like expectation values....

Topics: Atomic Physics, Quantum Physics, Condensed Matter, Quantum Gases, Physics

Source: http://arxiv.org/abs/1601.01554

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0.0

Jun 29, 2018
06/18

by
Etienne Jambon-Puillet; Dominic Vella; Suzie Protière

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We study the effect of film density on the uniaxial compression of thin elastic films at a liquid--fluid interface. Using a combination of experiments and theory, we show that dense films first wrinkle and then fold as the compression is increased, similarly to what has been reported when the film density is neglected. However, we highlight the changes in the shape of the fold induced by the film's own weight and extend the model of Diamant and Witten [\emph{Phys.~Rev.~Lett.}, 2011,...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.03366

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0.0

Jun 29, 2018
06/18

by
Guillaume Froehlicher; Etienne Lorchat; Stéphane Berciaud

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We probe the room temperature photoluminescence of $N$-layer molybdenum ditelluride (MoTe$_2$) in the continuous wave (cw) regime. The photoluminescence quantum yield of monolayer MoTe$_2$ is three times larger than in bilayer MoTe$_2$ and forty times greater than in the bulk limit. Mono- and bilayer MoTe$_2$ display almost symmetric emission lines at $1.10~\rm eV$ and $1.07~\rm eV$, respectively, which predominantly arise from direct radiative recombination of the A exciton. In contrast,...

Topics: Mesoscale and Nanoscale Physics, Materials Science, Condensed Matter

Source: http://arxiv.org/abs/1602.03071

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0.0

Jun 29, 2018
06/18

by
Manos Koukoutos; Etienne Kneuss; Viktor Kuncak

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We report our progress in scaling deductive synthesis and repair of recursive functional Scala programs in the Leon tool. We describe new techniques, including a more precise mechanism for encoding the space of meaningful candidate programs. Our techniques increase the scope of synthesis by expanding the space of programs we can synthesize and by reducing the synthesis time in many cases. As a new example, we present a run-length encoding function for a list of values, which Leon can now...

Topics: Logic in Computer Science, Computing Research Repository

Source: http://arxiv.org/abs/1611.07625

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0.0

Jun 29, 2018
06/18

by
Alexandre Cameron; Alexandros Alexakis; Marc-Étienne Brachet

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Large-scale hydrodynamic instabilities of periodic helical flows are investigated using $3$D Floquet numerical computations. A minimal three-modes analytical model that reproduce and explains some of the full Floquet results is derived. The growth-rate $\sigma$ of the most unstable modes (at small scale, low Reynolds number $Re$ and small wavenumber $q$) is found to scale differently in the presence or absence of anisotropic kinetic alpha (\AKA{}) effect. When an $AKA$ effect is present the...

Topics: Fluid Dynamics, Physics

Source: http://arxiv.org/abs/1605.03092

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0.0

Jun 29, 2018
06/18

by
Etienne Takou; Fidele L. Ciake Ciake

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In this paper, we consider the Cauchy problem for the relativistic Boltzmann equation with near vacuum initial data where the distribution function depends on the time, the position and the impulsion. The collision kernel considered here is for the hard potentials case and the background space-time in which the study is done is the Robertson-Walker space-time. Unique global (in time) mild solution is obtained in a suitable weighted space.

Topic: General Relativity and Quantum Cosmology

Source: http://arxiv.org/abs/1609.05613

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1.0

Jun 29, 2018
06/18

by
Etienne Wamba; Axel Pelster; James R. Anglin

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Experiments on trapped quantum gases can probe challenging regimes of quantum many-body dynamics, where strong interactions or non-equilibrium states prevent exact solutions. Here we present an exact result which holds even when no exact solutions can be found: a class of spacetime mappings of different experiments onto each other, as long as the gas particles interact via two-body potentials which possess a scaling property that most real interactions do possess. Since our result is an...

Topics: Condensed Matter, Quantum Gases

Source: http://arxiv.org/abs/1603.06626

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0.0

Jun 29, 2018
06/18

by
Ibrahima Dramé; Etienne Pardoux; Ahmadou Bamba Sow

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We study the exploration (or height) process of a continuous time non-binary Galton-Watson random tree, in the subcritical, critical and supercritical cases. Thus we consider the branching process in continuous time (Z_{t})_{t\geq 0}, which describes the number of offspring alive at time t. We then renormalize our branching process and exploration process, and take the weak limit as the size of the population tends to infinity. Finally we deduce a Ray-Knight representation.

Topics: Probability, Mathematics

Source: http://arxiv.org/abs/1602.02007

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0.0

Jun 29, 2018
06/18

by
Etienne de Klerk; François Glineur; Adrien B. Taylor

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We consider the gradient (or steepest) descent method with exact line search applied to a strongly convex function with Lipschitz continuous gradient. We establish the exact worst-case rate of convergence of this scheme, and show that this worst-case behavior is exhibited by a certain convex quadratic function. We also give the tight worst-case complexity bound for a noisy variant of gradient descent method, where exact line-search is performed in a search direction that differs from negative...

Topics: Optimization and Control, Mathematics

Source: http://arxiv.org/abs/1606.09365

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0.0

Jun 29, 2018
06/18

by
Milka Hutagalung; Norbert Hundeshagen; Dietrich Kuske; Martin Lange; Etienne Lozes

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We consider simulation games played between Spoiler and Duplicator on two B\"uchi automata in which the choices made by Spoiler can be buffered by Duplicator in several buffers before she executes them on her structure. We show that the simulation games are useful to approximate the inclusion of trace closures of languages accepted by finite-state automata, which is known to be undecidable. We study the decidability and complexity and show that the game with bounded buffers can be decided...

Topics: Formal Languages and Automata Theory, Logic in Computer Science, Computing Research Repository

Source: http://arxiv.org/abs/1609.04098

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0.0

Jun 29, 2018
06/18

by
Milka Hutagalung; Norbert Hundeshagen; Dietrich Kuske; Martin Lange; Etienne Lozes

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We consider simulation games played between Spoiler and Duplicator on two Buchi automata in which the choices made by Spoiler can be buffered by Duplicator in two different buffers before she executes them on her structure. Previous work on such games using a single buffer has shown that they are useful to approximate language inclusion problems. We study the decidability and complexity and show that games with two buffers can be used to approximate corresponding problems on finite transducers,...

Topics: Formal Languages and Automata Theory, Computing Research Repository, Computer Science and Game...

Source: http://arxiv.org/abs/1608.00654

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0.0

Jun 29, 2018
06/18

by
Caleb Devine; Zachariah B. Etienne; Sean T. McWilliams

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The Spinning Effective One Body-Numerical Relativity (SEOBNR) series of gravitational wave approximants are among the best available for Advanced LIGO data analysis. Unfortunately, SEOBNR codes as they currently exist within LALSuite are generally too slow to be directly useful for standard Markov-Chain Monte Carlo-based parameter estimation (PE). Reduced-Order Models (ROMs) of SEOBNR have been developed for this purpose, but there is no known way to make ROMs of the full eight-dimensional...

Topics: Astrophysics, High Energy Astrophysical Phenomena, General Relativity and Quantum Cosmology

Source: http://arxiv.org/abs/1601.03393

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0.0

Jun 29, 2018
06/18

by
Valentin Blomer; Étienne Fouvry; Emmanuel Kowalski; Philippe Michel; Djordje Milićević

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We revisit a recent bound of I. Shparlinski and T. P. Zhang on bilinear forms with Kloosterman sums, and prove an extension for correlation sums of Kloosterman sums against Fourier coefficients of modular forms. We use these bounds to improve on earlier results on sums of Kloosterman sums along the primes and on the error term of the fourth moment of Dirichlet $L$-functions.

Topics: Number Theory, Mathematics

Source: http://arxiv.org/abs/1604.07664

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Jun 29, 2018
06/18

by
Mohammed Jabi; Etienne Pierre-Doray; Leszek Szczecinski; Mustapha Benjillali

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In this work, we propose a coding strategy designed to enhance the throughput of hybrid ARQ (HARQ) transmissions over i.i.d. block-fading channels with the channel state information (CSI) unknown at the transmitter. We use a joint packet coding where the same channel block is logically shared among many packets. To reduce the complexity, we use a two-layer coding where, first, packets are first coded by the binary compressing encoders, and the results are then passed to the conventional channel...

Topics: Information Theory, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1607.06879

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Jun 29, 2018
06/18

by
Étienne Fodor; Hisao Hayakawa; Paolo Visco; Frédéric van Wijland

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We build up a phenomenological picture in terms of the effective dynamics of a tracer confined in a cage experiencing random hops to capture somec haracteristics of glassy systems. This minimal description exhibits scale invariance properties for the small-displacement distribution that echo experimental observations. We predict the existence of exponential tails as a cross-over between two Gaussian regimes. Moreover, we demonstrate that the onset of glassy behavior is controlled only by two...

Topics: Soft Condensed Matter, Statistical Mechanics, Condensed Matter

Source: http://arxiv.org/abs/1601.06613

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Jun 29, 2018
06/18

by
Valentin Resseguier; Etienne Mémin; Dominique Heitz; Bertrand Chapron

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We introduce a stochastic modelling in the constitution of fluid flow reduced-order models. This framework introduces a spatially inhomogeneous random field to represent the unresolved small-scale velocity component. Such a decomposition of the velocity in terms of a smooth large-scale velocity component and a rough, highly oscillating, component gives rise, without any supplementary assumption, to a large-scale flow dynamics that includes a modified advection term together with an...

Topics: Fluid Dynamics, Physics

Source: http://arxiv.org/abs/1611.06832

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Jun 29, 2018
06/18

by
Noemie Globus; Denis Allard; Etienne Parizot; Cyril Lachaud; Tsvi Piran

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The Telescope Array (TA) shows a 20$^{\circ}$ hotspot as well as an excess of UHECRs above 50~EeV when compared with the Auger spectrum. We consider the possibility that both the TA excess and hotspot are due to a dominant source in the Northern sky. We carry out detailed simulations of UHECR propagation in both the intergalactic medium and the Galaxy, using different values for the intergalactic magnetic field. We consider two general classes of sources: transients and steady, adopting a mixed...

Topics: Astrophysics, High Energy Astrophysical Phenomena

Source: http://arxiv.org/abs/1610.05319

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Jun 29, 2018
06/18

by
Johann Förster; Etienne Plesiat; Alvaro Magana; Alejandro Saenz

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The geometry-dependent ionization behavior of the ammonia molecule is investigated. Different theoretical approaches for obtaining the ionization yield are compared, all of them showing a strong dependence of the ionization yield on the inversion coordinate at long wavelengths ($\geq$ 800 nm). It is shown how this effect can be exploited to create and probe nuclear wave packets in neutral ammonia using Lochfra{\ss}. Furthermore, imaging of a wave packet tunneling through the barrier of a...

Topics: Atomic Physics, Physics

Source: http://arxiv.org/abs/1608.01861

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Jun 29, 2018
06/18

by
Etienne Bernard; Laurent Desvillettes; François Golse; Valeria Ricci

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In this short paper, we formally derive the thin spray equation for a steady Stokes gas, i.e. the equation consists in a coupling between a kinetic (Vlasov type) equation for the dispersed phase and a (steady) Stokes equation for the gas. Our starting point is a system of Boltzmann equations for a binary gas mixture. The derivation follows the procedure already outlined in [Bernard-Desvillettes-Golse-Ricci, arXiv:1608.00422 [math.AP]] where the evolution of the gas is governed by the...

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1609.02504

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Jun 29, 2018
06/18

by
Benoit Combès; Dominique Heitz; Anthony Guibert; Etienne Mémin

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We investigate the combined use of a Kinect depth sensor and of a stochastic data assimilation method to recover free-surface flows. More specifically, we use a Weighted ensemble Kalman filter method to reconstruct the complete state of free-surface flows from a sequence of depth images only. This particle filter accounts for model and observations errors. This data assimilation scheme is enhanced with the use of two observations instead of one classically. We evaluate the developed approach on...

Topics: Fluid Dynamics, Physics

Source: http://arxiv.org/abs/1601.00507

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Jun 29, 2018
06/18

by
Jie Zhao; Stuart A. Gilchrist; Guillaume Aulanier; Brigitte Schmieder; Etienne Pariat; Hui Li

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We studied the magnetic topology of active region 12158 on 2014 September 10 and compared it with the observations before and early in the flare which begins at 17:21 UT (SOL2014-09-10T17:45:00). Our results show that the sigmoidal structure and flare ribbons of this active region observed by SDO/AIA can be well reproduced from a Grad-Rubin non linear force free field extrapolation method. Various inverse-S and -J shaped magnetic field lines, that surround a coronal flux rope, coincide with the...

Topics: Astrophysics, Solar and Stellar Astrophysics

Source: http://arxiv.org/abs/1603.07563

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Jun 29, 2018
06/18

by
Steven J. Rennie; Etienne Marcheret; Youssef Mroueh; Jarret Ross; Vaibhava Goel

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Recently it has been shown that policy-gradient methods for reinforcement learning can be utilized to train deep end-to-end systems directly on non-differentiable metrics for the task at hand. In this paper we consider the problem of optimizing image captioning systems using reinforcement learning, and show that by carefully optimizing our systems using the test metrics of the MSCOCO task, significant gains in performance can be realized. Our systems are built using a new optimization approach...

Topics: Computer Vision and Pattern Recognition, Artificial Intelligence, Computing Research Repository,...

Source: http://arxiv.org/abs/1612.00563

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Jun 29, 2018
06/18

by
Ryan Cloutier; René Doyon; Kristen Menou; Xavier Delfosse; Xavier Dumusque; Étienne Artigau

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M-dwarfs are known to commonly host high-multiplicity planetary systems. Therefore M-dwarf planetary systems with a known transiting planet are expected to contain additional small planets ($r_p \le 4$ R$_{\oplus}$, $m_p \lesssim 20$ M$_{\oplus}$) that are not seen in transit. In this study we investigate the effort required to detect such planets using precision velocimetry around the sizable subset of M-dwarfs which are slowly rotating ($P_{\mathrm{rot}} \gtrsim 40$ days) and hence more...

Topics: Earth and Planetary Astrophysics, Astrophysics

Source: http://arxiv.org/abs/1610.09667

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Jun 29, 2018
06/18

by
Bruno Naylor; Miroslaw Brewczyk; Mariusz Gajda; Olivier Gorceix; Etienne Marechal; Laurent Vernac; Bruno Laburthe-Tolra

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We study the impact of spin-exchange collisions on the dynamics of Bose-Einstein condensation, by rapidly cooling a chromium multi-component Bose gas. Despite relatively strong spin-dependent interactions, the critical temperature for Bose-Einstein condensation is reached before the spin-degrees of freedom fully thermalize. The increase in density due to Bose-Einstein condensation then triggers spin dynamics, hampering the formation of condensates in spin excited states. Small metastable spinor...

Topics: Condensed Matter, Quantum Gases

Source: http://arxiv.org/abs/1607.02406

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Jun 29, 2018
06/18

by
Mohammed Jabi; Abdellatif Benyouss; Mael Le Treust; Etienne Pierre-Doray; Leszek Szczecinski

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In this work, we investigate a coding strategy devised to increase the throughput in hybrid ARQ (HARQ) transmission over block fading channel. In our approach, the transmitter jointly encodes a variable number of bits for each round of HARQ. The parameters (rates) of this joint coding can vary and may be based on the negative acknowledgment (NACK) provided by the receiver or, on the past (outdated) information about the channel states. These new degrees of freedom allow us to improve the match...

Topics: Information Theory, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1606.05182